:root {
  --bg: #0f1115;
  --bg-soft: #161a21;
  --bg-card: #1c2128;
  --border: #2a313b;
  --text: #e6e9ef;
  --text-dim: #9aa4b2;
  --accent: #4f8cff;
  --accent-hover: #6a9eff;
  --green: #4ade80;
  --red: #f87171;
  --yellow: #fbbf24;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  min-height: 100%;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 14px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  color: var(--accent-hover);
}

button {
  font-family: inherit;
  font-size: 13px;
  cursor: pointer;
  border: 1px solid var(--border);
  background: var(--bg-soft);
  color: var(--text);
  padding: 8px 14px;
  border-radius: 6px;
  transition: all 0.15s;
}

button:hover {
  border-color: var(--accent);
  background: var(--bg-card);
}

button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

button.primary:hover {
  background: var(--accent-hover);
}

input, textarea, select {
  font-family: inherit;
  font-size: 13px;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 12px;
  width: 100%;
  outline: none;
  transition: border-color 0.15s;
}

input:focus, textarea:focus, select:focus {
  border-color: var(--accent);
}

textarea {
  resize: vertical;
  min-height: 120px;
  font-family: "JetBrains Mono", "Consolas", "Monaco", monospace;
}

.layout {
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px 20px 60px;
  flex: 1 0 auto;
  width: 100%;
  box-sizing: border-box;
}

.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-soft);
  position: sticky;
  top: 0;
  z-index: 10;
}

.header-inner {
  max-width: 1100px;
  margin: 0 auto;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: 0.5px;
}

.logo span {
  color: var(--accent);
}

.header-nav a {
  color: var(--text-dim);
  margin-left: 16px;
  font-size: 13px;
}

.header-nav a:hover {
  color: var(--accent);
}

.tool-header {
  margin-bottom: 20px;
}

.tool-header h1 {
  font-size: 22px;
  font-weight: 600;
  margin-bottom: 6px;
}

.tool-header p {
  color: var(--text-dim);
  font-size: 13px;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px;
  margin-bottom: 16px;
}

.row {
  display: flex;
  gap: 10px;
  margin-bottom: 12px;
  flex-wrap: wrap;
  align-items: center;
}

.row > label {
  min-width: 80px;
  color: var(--text-dim);
  font-size: 13px;
}

.btn-group {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.output {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 12px;
  font-family: "JetBrains Mono", "Consolas", monospace;
  font-size: 13px;
  white-space: pre-wrap;
  word-break: break-all;
  min-height: 40px;
  margin-top: 8px;
}

.output.empty {
  color: var(--text-dim);
}

.output.error {
  color: var(--red);
}

.tag {
  display: inline-block;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 2px 8px;
  font-size: 12px;
  color: var(--text-dim);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 14px;
}

.grid-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 18px;
  transition: all 0.15s;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.grid-item:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.grid-item .name {
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
}

.grid-item .desc {
  font-size: 12px;
  color: var(--text-dim);
}

.footer {
  text-align: center;
  color: var(--text-dim);
  font-size: 12px;
  padding: 30px 20px;
  border-top: 1px solid var(--border);
  margin-top: auto;
  flex-shrink: 0;
}

code.inline {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1px 6px;
  font-size: 12px;
  font-family: "JetBrains Mono", "Consolas", monospace;
}